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Virtual steering of induction tool attenuation and phase difference measurements

Active Publication Date: 2012-10-23
HALLIBURTON ENERGY SERVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the most reliable induction tools are not configured to measure transmitter-receiver couplings.
Unfortunately linear superposition does not apply for signal attenuation and phase differences, so the measurements of these tools cannot be manipulated using existing techniques.

Method used

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  • Virtual steering of induction tool attenuation and phase difference measurements
  • Virtual steering of induction tool attenuation and phase difference measurements
  • Virtual steering of induction tool attenuation and phase difference measurements

Examples

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Embodiment Construction

[0019]Turning now to the figures, FIG. 1 shows a well during drilling operations. A drilling platform 2 is equipped with a derrick 4 that supports a hoist 6. Drilling of oil and gas wells is carried out by a string of drill pipes connected together by “tool” joints 7 so as to form a drill string 8. The hoist 6 suspends a kelly 10 that lowers the drill string 8 through rotary table 12. Connected to the lower end of the drill string 8 is a drill bit 14. The bit 14 is rotated and drilling accomplished by rotating the drill string 8, by use of a downhole motor near the drill bit, or by both methods.

[0020]Drilling fluid, termed mud, is pumped by mud recirculation equipment 16 through supply pipe 18, through drilling kelly 10, and down through the drill string 8 at high pressures and volumes to emerge through nozzles or jets in the drill bit 14. The mud then travels back up the hole via the annulus formed between the exterior of the drill string 8 and the borehole wall 20, through a blowo...

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Abstract

An apparatus and method that provide steerable measurements of attenuation and phase difference are disclosed. In a preferred embodiment, a logging tool is provided with two triads of orthogonal receivers and a triad of orthogonal transmitters. A controller in the logging tool fires selected transmitters singly and in pairs, and determines measurements of ratios between signals received by the receiver triads. The measurement of sixteen ratios is sufficient to allow determination of attenuation and phase difference that would be measured by virtually steered receivers according to equations provided herein.

Description

BACKGROUND[0001]1. Field of the Invention[0002]The present invention generally relates to the measurement of properties of earth formations. More particularly, the present invention relates to a method for virtual steering of induction tool measurements to determine formation properties such as dip angle and formation resistivity.[0003]2. Description of the Related Art[0004]The basic principles and techniques for electromagnetic logging for earth formations are well known. Induction logging to determine the resistivity (or its inverse, conductivity) of earth formations adjacent a borehole, for example, has long been a standard and important technique in the search for and recovery of subterranean petroleum deposits. In brief, the measurements are made by inducing electrical eddy currents to flow in the formations in response to an AC transmitter signal, and measuring the appropriate characteristics of a receiver signal generated by the formation eddy currents. The formation properti...

Claims

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Application Information

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IPC IPC(8): G06G7/48G01V3/18E21B47/022G01V3/28
CPCE21B47/02216G01V3/28E21B47/0228
Inventor SAN MARTIN, LUIS E.
Owner HALLIBURTON ENERGY SERVICES INC
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